Meteoritical Bulletin: Entry for Northwest Africa 8426

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Northwest Africa 8426

Basic information

Name: Northwest Africa 8426
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8426
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 581 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 280 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 25 Nov 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8426 (NWA 8426)

(Northwest Africa)

Purchased: 2014 Mar

Classification: HED achondrite (Eucrite, monomict)

History: Purchased in Temara, Morocco by Adam Aaronson in March 2014.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of large gabbroic eucrite clasts within a sparse matrix of finer related mineral debris. Clasts consist of reddish-brown pigeonite (zoned and partly exsolved), polycrystalline calcic plagioclase, silica polymorph, ilmenite, Ti-chromite and troilite.

Geochemistry: Pigeonite grains consist of exsolution lamellae of clinopyroxene (Fs_27.5-29.2Wo_42.6-40.1; FeO/MnO = 28-31, N = 3) within host orthopyroxene (Fs_59.4-59.9Wo_4.6-3.6; FeO/MnO = 28-30, N = 3).

Classification: Eucrite (breccia, gabbroic). This specimen is likely paired with NWA 7989 and other such stones based on close similarities in lithology, shock and style of weathering.

Specimens: 20.5 g including one polished thin section at UWB. The remainder is held by Aaronson.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2014 Mar
Mass (g):	581
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	27.5-29.2; 59.4-59.9
Wollastonite (mol%):	42.6-40.1; 4.6-3.6
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.5
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	M1691; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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